Why the Right Underlayment Matters — and Why RoofingFoil™ Stands Out
If you’re considering a new metal roof—or even just curious about how to keep your attic cooler—this video is a must-watch. It dives into one of the most important but often overlooked parts of a roofing system: the underlayment, and how it plays a powerful role in reflecting heat.
Key Takeaways from the Video
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A standard underlayment (felt, synthetic, etc.) under a metal roof does little to stop radiant heat from penetrating into the structure.
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The video demonstrates how a high-performance radiant barrier underlayment like RoofingFoil™ + Underlayment All-in-One can dramatically reduce heat transfer from the roof down into the attic or living spaces.
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It shows comparative tests (thermal images, temperature readings) that make the difference in performance clear to see.
In short: the better your underlayment reflectivity and emissivity, the more you prevent unwanted radiant heat from turning your attic into an oven.
How RoofingFoil™ Outperforms
At RoofingFoil™, we’ve engineered our radiant barrier underlayment to deliver exceptional thermal performance. Here’s how we compare to ordinary underlayments:
| Feature | Common Underlayments | RoofingFoil™ + Underlayment |
| Reflectivity (how much solar energy is bounced away) | Usually ≤ 40–60% | Up to 97% |
| Emissivity (how much heat is re-radiated) | Typically fairly high | Very low (≈ 0.03) |
| Durability (resistance to dust, oxidation, damage) | Susceptible to performance loss over time | Protected under the roof — maintains reflectivity |
| Easy integration in roofing systems | Designed for installation under metal roof panels | Designed for installation under metal roof panels |
Because RoofingFoil™ maintains such high reflectivity and low emissivity, the video’s visuals (e.g. thermal imaging) clearly show how much cooler the protected surface stays compared to the standard roof underlayments.
What You’ll Actually Feel in Your Home
When you combine a metal roof with a radiant barrier underlayment like RoofingFoil™ + Underlayment All-in-One:
- Your attic temperatures can drop by 20–30°F (or more) during hot summer days
- Your HVAC system deals with less heat load, reducing run time
- Indoor comfort improves—especially in rooms just below the roof
- Energy bills shrink without changing your cooling habits
That video is a powerful visual confirmation of what physics and building science tell us: not all underlayments are equal. If you’re going with a metal roof, using a radiant barrier underlayment like RoofingFoil™ + Underlayment All-in-One is one of the smartest steps you can take to lock in energy savings, improve comfort, and protect your home’s performance over time.